Goog is happy. They want to push phone partners to break away from carriers, and this is a prime example. You break from the carrier, now you can concentrate on timely software upgrade.
Unlocking bootloaders isn't that hard. In the past HTC made it real easy. Not sure on the One. The Nexus 4 ships w/ locked bootloader too. It took me 20 minutes to root. Software has gotten much better than the old adb days..
LTE is a nice to have. N4 works fine on TMo HSPA+. Verizon barely has 50% of their phones on LTE, and the others are babies on deploying. They are going to light up new freq and break the current phones anyways.